docs: def calculate_tree_length(self):
          """
          Walks the tree and calculate the tree length
          """
          tree_length = 0
  
          for ext in self.tree:
              tree_length += len(ext) + 2
  
              for relpath in self.tree[ext]:
                  tree_length += len(relpath) + 2
  
                  for filename in self.tree[ext][relpath]:
                      tree_length += len(filename) + 1 + 18
  
          return tree_length + 1